Influence of El Niño Southern Oscillation phenomenon on coastal phytoplankton in a mixohaline ecosystem on the southeastern of South America: Río de la Plata estuary
| Autor: | Nora Gómez, María Belén Sathicq, Delia Elena Bauer |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente
Argentina Fresh Water FRESHWATER TIDAL ZONE Aquatic Science Oceanography Freshwater tidal zone Río de la Plata estuary Cyanobacteria Ciencias de la Tierra y relacionadas con el Medio Ambiente Phytoplankton Structural responses Hydrology (agriculture) Freshwater tidal zone EL NIÑO SOUTHERN OSCILLATION PHENOMENON PHYTOPLANKTON Phytoplankton Ciencias Naturales Ecosystem Zoología Río de la Plata estuary El Nino-Southern Oscillation Biomass (ecology) geography geography.geographical_feature_category Ecology Estuary Structural responses Biología Marina Limnología South America Pollution STRUCTURAL RESPONSES La Niña El Niño Southern Oscillation El Niño Southern Oscillation phenomenon Period (geology) Environmental science Hydrology RÍO DE LA PLATA ESTUARY Estuaries CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP CIC Digital (CICBA) Comisión de Investigaciones Científicas de la Provincia de Buenos Aires instacron:CICBA |
| Popis: | The aim of this study was to analyze the density, diversity, biomass and assemblage composition of the phytoplankton in relation to environmental conditions (physical, chemical, hydrological and meteorological variables), measured under the different scenarios caused by the ENSO phenomenon in the period between 2005 and 2012, in six sampling sites in the tidal freshwater zone of the Río de la Plata estuary, covering almost 100 km of coastline. The results revealed changes in the structure of the phytoplankton, such as a significant reduction of diversity, and decreases in biomass and phytoplankton density, particularly during El Niño phases. Cyanobacteria were more abundant in the neutral periods, Chlorophyceae dominated La Niña phase while Bacyllariophyceae dominated El Niño. However, no complete replacement of species between cycles was observed. The results obtained were highly variable due to the inherent natural variability of the Río de la Plata, emphasized by the anthropogenic impact in this area. Instituto de Limnología "Dr. Raúl A. Ringuelet" |
| Databáze: | OpenAIRE |
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